检索结果-南通市图书馆

Bifurcation analysis of a food chain system incorporating time delay and the disease spreading among prey species

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bifurcation analysis of a food chain system incorporating ti...

执行器饱和多智能体系统的自适应学习一致性算法

第30届中国控制与决策会议

作者： xinyou meng Nini Qin Department of Applied Mathematics Lanzhou University of Technology

In this paper,a food chain system incorporating time delay and the disease spreading among prey species is *** positive of such system is *** the presence of time delay,some sufficient conditions of the local stability of the positive equilibrium and the existence of Hopf bifurcation are obtained by analyzing the corresponding characteristic equation,and the properties of Hopf bifurcation are showed by using the normal form theory and center manifold *** simulations are given to support our analytical results.

关键词： Food chain Eco-epidemiology Hopf bifurcation Delay

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

计算机应用研究 2021年第9期38卷 2737-2740页

作者：杨娜娜孟新友王璇兰州理工大学理学院兰州730050

针对一类受到执行器饱和高阶多智能体系统在有限时间区间[0,T]上的精确一致性问题,利用自适应迭代学习控制的方法,设计了具有全饱和差分型自适应更新律的时变增益。通过构造适当的复合能量函数,严格证明了一致性误差向量随着迭代次数趋... 详细信息

针对一类受到执行器饱和高阶多智能体系统在有限时间区间[0,T]上的精确一致性问题,利用自适应迭代学习控制的方法,设计了具有全饱和差分型自适应更新律的时变增益。通过构造适当的复合能量函数,严格证明了一致性误差向量随着迭代次数趋于无穷而一致趋于零,得到了不依赖于网络通信拓扑矩阵特征值的自适应学习一致性算法。最后,给出一个仿真例子,仿真结果说明了所提算法的有效性。

关键词：多智能体系统执行器饱和迭代学习控制自适应控制一致性

Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao meng Qingbin meng Hongwen Jing Bo meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

新时代高等数学“金课”建设新思路设计与研究——以数列极限概念为例

在线全文

学校读者我要写书评

暂无评论

科技风 2024年第12期 118-120页

作者：杨娜娜孟新友马成业兰州理工大学理学院甘肃兰州730050

随着科技的发展、时代的进步,偏向于理论推导的“高等数学”课程传统教学模式已无法满足这个时代社会对人才的需求,而“金课”是知识、能力和素养的融合,不仅让学生获得知识、掌握技能,更重要的是培养其创造性思维和解决复杂问题的综合... 详细信息

随着科技的发展、时代的进步,偏向于理论推导的“高等数学”课程传统教学模式已无法满足这个时代社会对人才的需求,而“金课”是知识、能力和素养的融合,不仅让学生获得知识、掌握技能,更重要的是培养其创造性思维和解决复杂问题的综合能力。本文将开展基于“金课”的“高等数学”教学研究工作,为进一步构建本科数学类金课课程提供积极探索,并以数列极限概念为例阐释其在高等数学“金课”探索中的应用。

关键词：金课建设高等数学数列极限

Joint Probabilistic Scheduling and Resource Allocation for Wireless Networked Control Systems

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2025年第1期 258-260页

作者： meng Zheng Lei Zhang Wei Liang IEEE the State Key Laboratory of Robotics and the Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences the University of Chinese Academy of Sciences

Dear Editor,This letter presents a joint probabilistic scheduling and resource allocation method(PSRA) for 5G-based wireless networked control systems(WNCSs). As a control-aware optimization method, PSRA minimizes the linear quadratic Gaussian(LQG) control cost of WNCSs by optimizing the activation probability of subsystems, the number of uplink repetitions, and the durations of uplink and downlink phases. Simulation results show that PSRA achieves smaller LQG control costs than existing works.

关键词：

The autophagy-lysosome pathway:a potential target in the chemical and gene therapeutic strategies for Parkinson’s disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 139-158页

作者： Fengjuan Jiao Lingyan meng Kang Du Xuezhi Li School of Mental Health Jining Medical UniversityJiningShandong ProvinceChina Shandong Collaborative Innovation Center for Diagnosis Treatment and Behavioral Interventions of Mental DisordersInstitute of Mental HealthJining Medical UniversityJiningShandong ProvinceChina

Parkinson’s disease is a common neurodegenerative disease with movement disorders associated with the intracytoplasmic deposition of aggregate proteins such asα-synuclein in *** one of the major intracellular degradation pathways,the autophagy-lysosome pathway plays an important role in eliminating these *** evidence has shown that upregulation of the autophagy-lysosome pathway may contribute to the clearance ofα-synuclein aggregates and protect against degeneration of dopaminergic neurons in Parkinson’s ***,multiple genes associated with the pathogenesis of Parkinson’s disease are intimately linked to alterations in the autophagy-lysosome ***,this pathway appears to be a promising therapeutic target for treatment of Parkinson’s *** this review,we briefly introduce the machinery of ***,we provide a description of the effects of Parkinson’s disease–related genes on the autophagy-lysosome ***,we highlight the potential chemical and genetic therapeutic strategies targeting the autophagy–lysosome pathway and their applications in Parkinson’s disease.

关键词： autophagy chemical therapy gene therapy Parkinson’s disease α-synuclein

A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 555-577页

作者： Linlin Sun Zihui Wang Shukun Cui Ziquan Yan Weiping Hu Qingchun meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks

Shaanxi History Museum

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Today 2025年第1期74卷 76-79页

作者： meng JIAXIN 不详

It is one of the must-visit history museums,known for its vast collection of historical artifacts,attracting around three million domestic and international visitors each *** Shaanxi History Museum(SHM),in the renowned historic city of Xi’an in Shaanxi Province,is often regarded as one of the museums most difficult to get a ticket to in *** day,approximately 12,000 free online tickets are made available and are fully booked within just a couple of *** vast collection of treasured relics and numerous national treasures leave visitors in awe.

关键词： History attracting visitors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

交叉路口车辆延误的调查与模型应用

甘肃科学学报 2015年第3期27卷 144-148页

作者：李宏怿马成业孟新友张肖利周亚飞兰州理工大学理学院甘肃兰州730050

为了有效减小在饱和度很大甚至超饱和状态下的信号交叉口延误计算误差,以总延误为目标函数,根据饱和度的计算结果选取不同的延误计算模型。在饱和度较小时,采用Webster稳态模型;当饱和度增大到0.9以上,采用Akcelik瞬态延误模型。通过实... 详细信息

为了有效减小在饱和度很大甚至超饱和状态下的信号交叉口延误计算误差,以总延误为目标函数,根据饱和度的计算结果选取不同的延误计算模型。在饱和度较小时,采用Webster稳态模型;当饱和度增大到0.9以上,采用Akcelik瞬态延误模型。通过实例计算,并与原有情况进行比较,说明根据饱和度来选取延误的动态化计算模型能有效减小延误,提高交叉口通行能力,对城市交叉口信号控制方案设计等具有一定参考意义。

关键词：饱和度延误 Webster稳态模型 Akcelik瞬态延误模型